<template>
    <div class="list" ref="wrapper">
      <div>
        <div class="area">
          <div class="title border-topbottom">当前城市</div>
          <div class="button-list">
            <div class="button-wrapper">
              <div class="button">{{this.currentCity}}</div>
            </div>
          </div>
        </div>
        <div class="area">
          <div class="title border-topbottom">热门城市</div>
          <div class="button-list">
            <div
              class="button-wrapper"
              v-for="item of hot"
              :key="item.id"
              @click="handleCityClick(item.name)"
            >
              <div class="button">{{item.name}}</div>
            </div>
          </div>
        </div>
        <div
          class="area"
          v-for="(item,key) of cities"
          :key="key"
          :ref="key"
        >
          <div class="title border-topbottom">{{key}}</div>
          <div class="item-list">
            <div
              class="item border-bottom"
              v-for="innerItem of item"
              :key="innerItem.id"
              @click="handleCityClick(innerItem.name)"
            >
              {{innerItem.name}}
            </div>
          </div>
        </div>
      </div>
    </div>
</template>

<script>
  import Bscroll from 'better-scroll'
  import {mapState,mapMutations} from 'vuex'
  export default {
    name: "CityList",
    props:{
      hot:Array,
      cities:Object,
      letter:String
    },
    computed:{
      ...mapState({
        currentCity:'city'
      })
    },
    mounted(){ //页面DOM元素挂载完毕再加载
      this.scroll = new Bscroll(this.$refs.wrapper)
    },
    //watch侦听器
    watch:{
      letter(){
        if(this.letter){
          const element = this.$refs[this.letter][0]
          this.scroll.scrollToElement(element)
        }
      }
    },
    methods:{
      handleCityClick(city){
        this.changeCity(city)
        this.$router.push('/')
      },
      ...mapMutations(['changeCity'])
    },
  }
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
.border-topbottom
  &:before
    border-color:#ccc
  &:after
    border-color:#ccc
.border-bottom
  &:before
    border-color:#ccc
.list
  overflow :hidden
  position:absolute
  top:1.58rem
  left:0
  right:0
  bottom:0
  .title
    line-height: .54rem
    background:#eeeeee
    padding-left: .2rem
    color:#666
    font-size:.26rem
  .button-list
    padding:.1rem .6rem .1rem .1rem
    overflow:hidden
    .button-wrapper
      width:33.33%
      float:left
      .button
        text-align:center
        margin:.1rem
        border:.02rem solid #cccccc
        padding:.1rem 0
        border-radius:.03rem
  .item-list
    .item
      line-height:.76rem
      padding-left:.2rem




</style>
